How do I get the Crota and Oryx masks?
Since the Festival of the Lost started, I've gotten pretty much every mask there is except for Crota and Oryx. Most of them I've gotten multiple times - I'm pretty sure I've been through at least a half-dozen of Petra Venj! This is particularly annoying since the Crota mask is required for one of the FotL quest lines.
Is there something particular that I need to do for the Crota/Oryx masks?
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Oryx and Crota cut scene
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Images: cottonbro, Ketut Subiyanto, Tatiana Syrikova, Norma Mortenson